Mediaplayer: acquire the wake-lock synchronously am: 0913cb17a0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/23516263

Change-Id: I79bcc3fff35a21f23654c93840a807ad06f9c877
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>